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This extension is in early conception phase and currently only supports usage of the Doctrine library from other extensions. This extension reuses the database connection of TYPO3, so no database connection must be made to use Doctrine.

Relations in Doctrine don't have "filters" e.g. to have only entities with deleted = false in a relation

This can be done without a change to Doctrine source: The custom relation for foreign keys with additional condition itself is subclassed from Doctrine_Relation_ForeignKey and used by a custom Doctrine_Table and Doctrine_Relation_Parser.